221261107456 has 27 divisors (see below), whose sum is σ = 441672937111. Its totient is φ = 110626790656.

The previous prime is 221261107429. The next prime is 221261107477. The reversal of 221261107456 is 654701162122.

The square root of 221261107456 is 470384.

It is a perfect power (a square), and thus also a powerful number.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 7511445 + ... + 7540843.

Almost surely, 2^221261107456 is an apocalyptic number.

221261107456 is the 470384-th square number.

It is an amenable number.

221261107456 is a deficient number, since it is larger than the sum of its proper divisors (220411829655).

221261107456 is an frugal number, since it uses more digits than its factorization.

221261107456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58814 (or 29401 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 37.

Adding to 221261107456 its reverse (654701162122), we get a palindrome (875962269578).

The spelling of 221261107456 in words is "two hundred twenty-one billion, two hundred sixty-one million, one hundred seven thousand, four hundred fifty-six".